CATDOLL : CATDOLL: How do fish grow? What is the fastest growing fish?

1. What is the growth process of fish?

A fish goes through five stages in its life: embryonic stage, fry, seedling, young fish, sub-adult fish and adult fish. The embryonic stage is the very beginning period of the fish, which refers to the time from the fertilized egg to the hatching of adult fish. The newly hatched fish is the fry. After three to five weeks, the fry will grow into seedlings, and then go through the young fish and adult fish stages before finally growing into adult fish.

2. What are the fastest growing fish?

1. Snakehead

Snakehead fish is a common edible fish, also known as mullet, raw fish, fortune fish, snake fish, firehead fish, etc. It mainly grows in still water or micro-flowing water with dense aquatic plants and fine bottom mud. Snakehead fish is a freshwater fish variety farmed in many areas. Generally, it can reach a weight of 0.5-0.7 kg after 8-9 months of breeding. It is a fast-growing fish with high economic value.

2. Black carp

Black carp is one of the four major fish species in my country and is currently being artificially raised in many areas. Black carp mainly grows in the middle and lower waters, and the most suitable water temperature for its growth is 22-28 degrees. It mainly feeds on snails, clams, mussels, clams, shrimps and insects. It grows very fast and can grow up to about 70 kilograms.

3. Grass carp

Grass carp is also one of the four major carps and the most artificially raised fish species in my country. Grass carp mainly grows in the middle and lower layers of water and in waters with abundant aquatic plants. It is a freshwater fish that feeds on grass. Grass carp grows relatively fast, and the largest individual can reach about 40 kilograms.

4. Catfish

Everyone is familiar with catfish, and they are artificially raised in many areas. Catfish mainly live in the middle and lower layers of rivers, lakes, reservoirs, and ponds. They are a kind of freshwater fish with fast reproduction, strong survival ability, and fast growth. Many people don’t know that they can grow 6 kilograms in half a year. They are also a freshwater fish species raised in many areas.

5. Silver Carp

Silver carp, also known as silver carp, mainly lives in the upper and middle layers of water. In winter, the temperature is low, so it will hibernate in deep waters. Silver carp mainly feeds on plankton in the water. It is a typical filter-feeding fish and its growth rate is also relatively fast.

6. Bighead carp

Bighead carp is a kind of fish that many people like to eat. The chopped pepper fish head we often eat is made of bighead carp. Bighead carp mainly lives in the middle and upper layers of water, mainly feeds on plankton in the water, and grows relatively fast.

7. Wuchang Fish

Wuchang fish is a fish that is unique to my country and is produced in the middle and lower reaches of the Yangtze River. It grows fast and has strong disease resistance, making it a very easy-to-breed fish. In addition, Wuchang fish has tender meat and is particularly suitable for steaming. Steamed Wuchang fish is a traditional dish in Hubei Province and is deeply loved by people in Hubei and even the whole country.

3. What are the reasons for fish growth and reproduction?

1. Oviparous. This is the reproduction method of most fish. The fish expel the eggs from the body, and the embryos develop completely outside the body. The nutrients are provided by the eggs and have nothing to do with the mother's nutrition.

2. Ovoviviparity: The fertilized egg develops in the mother's reproductive tract, and its nutrition is provided by the yolk, which has nothing to do with the mother's nutrition.

3. Viviparity. The fertilized eggs of some fish develop in the mother's reproductive tract, and the embryos are connected to the mother's blood circulation. The development of these embryos is not only nourished by the yolk, but also related to the mother's nutrition.

Extended information: In order to breed excellent fry, you must choose healthy broodstock with excellent color, fins and size for breeding. Special care, close attention to water quality changes, live bait, or occasional feeding of fish grass can breed the best fry. Some fish have special requirements for water quality conditions when breeding. Be careful to prevent broodstock from swallowing their own eggs or fry. Fish lovers can estimate the number of fry based on the smooth spawning situation and provide enough food for the fry.

4. What are the fish that grow at low temperatures?

How low is the so-called low temperature? If it refers to wide-temperature fish, that is, most of the fish that can spend the summer and winter outdoors in China, such as the Chinese croaker, striped barbel, the most beautiful tetra, white-faced shrimp, Sichuan shrimp, garfish, dogfish, etc. If it refers to low-temperature fish, that is, fish that cannot survive in hot water, there is the plateau schizothorax, which is generally found in western Sichuan, and some cave fish are also low-temperature fish. The water does not freeze.

5. What kinds of fish can grow in dark environments?

Fish that live in dark environments - cave fish.

The basic characteristics of cave fish are: eyes are reduced or disappeared; the body is without pigment, in a translucent state, and the internal organs are vaguely visible; the scales are smaller, sparsely arranged or completely buried under the skin; the sense of touch is sensitive, the tentacles are well-developed or have derived sensory organs. These traits are called convergent characteristics in biology. The disappearance of their eyes is not caused by trauma or pathology, but the result of high adaptation to the environment, and can be inherited to the next generation. Cave fish are also called blind fish, eyeless fish, and transparent fish. They have developed a unique physiological structure to adapt to the environment because they have lived in a dark environment for a long time. Admittedly, their value cannot be measured according to traditional edible or delicious standards, but as examples of biological adaptation to the environment, they are rare treasures in museum displays or intuitive teaching.

The ancestors of cave fish are no different from the fish we see today. It is only because they strayed into an underground river and lived in darkness for a long time that they underwent great physiological changes to adapt to the changes in the environment. Moreover, they were able to pass on these changes from generation to generation, thus forming a biological species.

6. What are the growth characteristics of fish in Baiyangdian?

The growth characteristics of fish are:

1. Continuous growth: fish can continue to grow throughout their lives until they age and die;

2. Staged growth: fast growth before sexual maturity and slow growth after sexual maturity. Before sexual maturity, the main manifestation is a significant increase in body length, after sexual maturity, the length growth decreases and the weight growth increases. During the aging period, the growth of body length and weight decreases sharply.

3. Seasonal growth: rapid growth in spring and summer, and slow growth in autumn and winter. Understanding the above growth characteristics of fish can help us determine the breeding cycle of fish and choose the period of rapid growth for breeding; determine the fishing specifications of fish; timely catch and market individuals that have exceeded the rapid growth period to reduce the food consumption of the water body; and take effective breeding measures in the spring and summer when fish grow rapidly to accelerate fish growth.

7. In which season do fish grow fastest?

Summer and autumn.

The peak season for fish growth is generally from June to September each year. During this period, the water temperature is suitable, bait and fertilizer are sufficient, and fish eat vigorously. It is the golden season for fish growth. However, it should also be noted that due to the high temperature, fish are prone to disease.

However, due to the large latitude span between the north and south of my country, the corresponding temperature and seasonal changes are quite different, and the growing season lengths vary. For example, compared with the Yangtze River Basin, the north is generally delayed or advanced by about one month.

8. The longer the photoperiod, the faster the fish grow?

All things cannot grow without light, and fish are no exception. The color change of fish is the result of light; the healthy growth of fish also depends on the help of light. Therefore, if you want to keep fish healthy and beautiful, you must let them receive light. The light here includes both sunlight and artificial light in the home.

Tropical fish are very sensitive to sunlight.

The same tropical fish will show different colors when living in a strong light environment and a weak light environment. The color depth of many tropical fish is closely related to the light intensity.

9. What are the effects of different fish feed types on fish growth?

If it is the same series of feed, for example, from the fingerling stage to the rearing stage, and then to the adult stage, there is no problem using the same series of feed.

However, if the nutritional proportions of fish from different series or different manufacturers are generally different, it is likely to lead to nutritional deficiencies, such as vitamins, methionine, lysine, etc. The lack of these essential nutrients will cause mild cases of slow growth and decreased immunity of the fish, and severe cases will cause deficiency syndromes and developmental deformities.

10. Geographical and fish living conditions?

Fish live in water all their lives and breathe with gills. The water temperature should not be too high, not exceeding 40 degrees.